This post explains how to correlate SCSI devices within a Linux virtual machine to the virtual disk configured in the Virtual Machine. This can be accomplished by comparing the SCSI ID listed the Linux Guest OS and the virtual machine configuration in the vSphere client.
In the vSphere Client disks are numbered without any reference to their SCSI ID. Linux operating systems numbers disks based on their SCSI ID and in order of appearance. Usually, the first disk is /dev/sda, the second /dev/sdb and so on. But if you want to remove a disk for example you want to make sure to identify the disk correctly.
Read More »Match Linux SCSI Devices (sdX) to Virtual Disks in VMware